Crossword Genius

First-rate access to attic? (3-6)

Ross

I believe the answer is:

top-flight

I'm a little stuck... Click here to teach me more about this clue!

'access to attic?' is the definition.
(I've seen this before)

'first-rate' is the wordplay.
'first' becomes 'top' (synonyms).
'rate' becomes 'flight' (I can't explain this - if you can you should give a lot more credence to this answer).
'top'+'flight'='TOP-FLIGHT'

Can you help me to learn more?

(Other definitions for top-flight that I've seen before include "Highest level" , "Excellent -- best possible" , "Superior" , "Of the highest class" .)

I've seen this clue in The Guardian.
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